Overview

Skeleton Knights are the reanimated bones of once great warriors.

Skeleton Knights are more than 3 times stronger than their lesser undead comrades, the Skeletons, with quadruple hit points, low armor and double the damage output, rivaling that of Trolls. Thus, they are deadly to low-level soldiers, and still pose a threat even to the mighty Paladins. Swarming out from beneath their graves, if these warriors come out in big groups, they can clear out any unorganized, unprepared defense.

Strategy

Build at least one tower to keep an eye on Graveyards - they produce lots of skeletons. Good choices are Big Bertha and Teslas, these towers are capable of dealing area damage and thus can destroy groups of Skeletons and Skeleton Knights at once.

Focus on Necromancers rather than their skeletons. If you just kill the skeletons, more will soon appear. The Rangers Hideout with Poison Arrows is best for this: since skeletons are immune to poison, it will prioritize the Necromancers over them.

As usual, magic towers are best against armored enemies. While possessing a decent amount of health, Skeleton Knights move slowly, thus are extra vulnerable to the Mages' bolts.

Use Sorcerer Mage to get the Elemental to block them. They deal area damage.